Wellbore drilling with a top drive device
a top drive device and drilling technology, applied in drilling rods, drilling pipes, rotary drilling, etc., can solve the problems of reducing affecting the efficiency of drilling, so as to reduce the height of the top drive device
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[0295]FIG. 1 shows a wellbore drilling installation with a trolley, top drive device, and rotatable head clamp and carrier according to the invention. It is envisaged that the depicted installation is part of an offshore drilling vessel for performing offshore drilling and / or other wellbore related activities, e.g. well intervention. It will be appreciated that, when desired, the invention is also applicable to land based drilling installations.
[0296]The installation comprises a drilling tower 1 that is here embodied as a mast with a closed contoured steel structure with at least one firing line 5 outside of the mast itself. For example the mast is arranged adjacent a moonpool of a drilling vessel, or over a larger moonpool with two firing lines along opposed outer faces of the mast 1 as is known in the art.
[0297]In an alternative design the drilling tower is embodied as a derrick with the firing line within the structure of derrick, e.g. the derrick having a lattice structure place...
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